«اِلْحِزْنِ يْعَلِّمِ الْبُكَا وِالْفَرْحِ يْعَلِّمِ الزَّغَارِيطْ»

Life's circumstances act as their own teacher. Someone who has never learned to grieve finds the tears come when sorrow arrives, and someone unpracticed in celebration discovers the joyful cries once happiness calls for them, like the high, trilling ululations women traditionally raise at weddings and other happy occasions.

More broadly, the saying holds that each situation draws from people the conduct that suits it. Rather than preparing in advance for every role, we are shaped on the spot by events. Its point is how situations shape behavior, not a claim that grief and joy are equal or balanced.

Suitable when someone acts in an unexpected yet fitting way because events demanded it, such as a reserved person who suddenly mourns openly or celebrates loudly. It can gently excuse or explain behavior that circumstances, rather than habit or training, drew out.